nonpareil
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But why would everyone ELSE be selling it at $8 per gallon, if not because of supply and demand? "Competition" is just another way of saying supply and demand. The reason gas sells for approximately $3 per gallon, rather than approximately $8 per gallon, is because 3 dollars is approximately the price where the amount of gas that consumers are willing to buy, and the amount of gas that suppliers are willing to sell, are equal.
According to supply-demand theory the supply and demand would come to the equilibrium at all prices if market is left on its own.
The reason the price is $3 is because the Petroleum companies decide to sell it at $3. And for $3/galleon, they sell a certain amount to the consumers who are willing to buy it at that price. If the price goes up, they may sell less quantity depending on the demand elasticity of fuel. Competition in the oil industry is suspect given the fact that they seem to have a tacit agreement to not have a price war on each others. If there were perfect competition, then prices would come close to the supply costs + economic costs.
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